Acid resistant austenitic alloy for valve seat insert

a technology of austenitic alloy and intake valve seat, which is applied in the direction of machines/engines, engine components, mechanical equipment, etc., can solve the problems of severe corrosion of intake valve seat inserts made from m2, low sulfur content in diesel fuel, and increased concentration of sulfuric acid, so as to achieve good wear resistance

Inactive Publication Date: 2007-04-19
WINSERT
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  • Abstract
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Benefits of technology

[0013] It is another object of this invention to develop a c

Problems solved by technology

Sulfur content in diesel fuel seems relatively low, however, the concentration of sulfuric acid will likely increase with engine running time as combustion deposits from exhaust gas accumulated around inner wall area of an intake insert will absorb more sulfuric acid.
Severe corrosion can occur on intake valve seat inserts made from M2 tool steel once the amount of high concentration acid is enough.
However, more severe corrosion conditions in some engines with high sulfur fuel and high

Method used

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examples

[0015] Chemical compositions of all samples are given in table 1. These alloy samples were prepared in a 60 pounds industry frequency induction furnace by conventional atmosphere melting process, and the corrosion and hardness samples were cast into shell molds. The comparative alloy samples have compositions outside the scope of this invention. There are also two commercial alloys Stellite 3 and M2 listed in the table as comparative alloys.

[0016] Ring samples with 45 mm outer diameter, 32 mm inner diameter and 5 mm thickness were used as hardness samples and the hardness values of all samples were obtained using a Rockwell C hardness tester.

[0017] A high temperature cyclic corrosion tester was built to simulate sulfuric acid corrosion at high temperature. The new corrosion tester provides a better corrosion measurement method than the traditional static immersion corrosion test as both oxidation and high temperature are also important factors contributing to the corrosion process...

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Abstract

A high carbon austenitic iron base alloy for wear and corrosion resistant applications is developed for valve seat insert applications when corrosion resistance is required. The alloy comprises 1.8-2.8 wt % carbon, 0.5-3.5 wt % silicon, 10.0-25.0 wt % chromium, less than 1.5 wt % manganese, 2.0-10.0 wt % molybdenum and tungsten combined, 1.0-4.0 wt % niobium and vanadium combined, 0-1.0 wt % titanium, 0.01-0.2 wt % aluminum, 12-25 wt % nickel, 0.5-3.0 wt % copper, and the balance being iron and a small amount of impurities.

Description

BACKGROUND OF THE INVENTION [0001] 1. Technical Field [0002] This invention relates to an acid corrosion resistant and wear resistant austenitic iron base alloy that possesses excellent resistance to sulfuric acid and is superior to high speed steels for many applications where both sulfuric acid corrosion and wear occur simultaneously. This invention further relates to such a corrosion resistant alloy useful for making valve seat inserts used in internal combustion engines with exhaust gas recirculation (EGR) system. [0003] 2. Description of Related Art [0004] Internal combustion engines equipped with EGR systems require intake valve seat insert materials with excellent corrosion resistance due to formation of sulfuric acid in intake insert area when sulfur oxide that comes from diesel fuel after combustion meets with moisture from incoming air. Sulfur content in diesel fuel seems relatively low, however, the concentration of sulfuric acid will likely increase with engine running t...

Claims

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Application Information

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IPC IPC(8): C22C37/06
CPCB22F5/008C22C33/0285C22C38/04C22C38/06C22C38/42C22C38/44C22C38/46C22C38/48C22C38/56F01L3/02F01L2101/00F01L2301/00
Inventor LIANG, XUECHENG
Owner WINSERT
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